├── README.md ├── cmd ├── go.mod ├── go.sum ├── handler └── main.go ├── hdwallet └── main.go ├── main.go ├── models └── main.go └── modules └── main.go /README.md: -------------------------------------------------------------------------------- 1 | # Create an API to interact with Ethereum blockchain using Golang 2 | 3 | Hi folks! In this tutorial, we are going to learn how to create a simple REST API to interact with the Ethereum blockchain using Golang.  4 | Web3.js is the de-facto library to interact for interacting with Ethereum in JavaScript and Node.js. It takes care of encoding payloads and generating the RPC calls. Web3.js is very popular and heavily documented. 5 | On the other hand, (geth), the most popular Ethereum implementation, is written in Go. It’s a complete Ethereum node. If you build a dApp in Go, then you’ll be using the go-ethereum libraries directly which means you can do everything the node can do. 6 | 7 | Run: 8 | ```bash 9 | go run main.go 10 | ``` -------------------------------------------------------------------------------- /cmd: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | # source /Users/luis_acerv/.bash_profile 4 | 5 | FUNC=$1 6 | 7 | function sendTx() { 8 | # echo "Your private key" 9 | # read PRIV_KEY 10 | # echo "Destination address" 11 | # read TO_ADDR 12 | # post='{"privKey":"${PRIV_KEY}", "to":"${TO_ADDR}", "amount":1000000000000000000}' 13 | # echo $post 14 | # curl -d ${post} -H "Content-Type: application/json" -X POST http://localhost:8080/api/v1/eth/send-eth 15 | curl -d '{"privKey":"6d76e6f38bd3a1e1abbba37f03bb74a65ec7948a36db050ad190aa7f384c45d8", "to":"0x00Ea26936a4b0868aD6BEA4FDb847D457765544B", "amount":1000000000000000000}' -H "Content-Type: application/json" -X POST http://localhost:8080/api/v1/eth/send-eth 16 | } 17 | 18 | $FUNC -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/LuisAcerv/goeth-api 2 | 3 | go 1.13 4 | 5 | require ( 6 | github.com/defistuff/go-bip39 v1.0.2 7 | github.com/defistuff/go-ethereum-hdwallet v0.0.1 8 | github.com/ethereum/go-ethereum v1.9.22 9 | github.com/gorilla/mux v1.8.0 10 | ) 11 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 2 | github.com/Azure/azure-pipeline-go v0.2.1/go.mod h1:UGSo8XybXnIGZ3epmeBw7Jdz+HiUVpqIlpz/HKHylF4= 3 | github.com/Azure/azure-pipeline-go v0.2.2/go.mod h1:4rQ/NZncSvGqNkkOsNpOU1tgoNuIlp9AfUH5G1tvCHc= 4 | 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golang.org/x/sys v0.0.0-20200814200057-3d37ad5750ed/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 323 | golang.org/x/sys v0.0.0-20200824131525-c12d262b63d8 h1:AvbQYmiaaaza3cW3QXRyPo5kYgpFIzOAfeAAN7m3qQ4= 324 | golang.org/x/sys v0.0.0-20200824131525-c12d262b63d8/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs= 325 | golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= 326 | golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk= 327 | golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k= 328 | golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ= 329 | golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 h1:SvFZT6jyqRaOeXpc5h/JSfZenJ2O330aBsf7JfSUXmQ= 330 | golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ= 331 | golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ= 332 | golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs= 333 | golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs= 334 | golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q= 335 | golang.org/x/tools v0.0.0-20190912185636-87d9f09c5d89/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo= 336 | golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo= 337 | golang.org/x/tools v0.0.0-20200117012304-6edc0a871e69/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28= 338 | golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= 339 | golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= 340 | golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod 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google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo= 350 | google.golang.org/protobuf v1.23.0 h1:4MY060fB1DLGMB/7MBTLnwQUY6+F09GEiz6SsrNqyzM= 351 | google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU= 352 | gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw= 353 | gopkg.in/bsm/ratelimit.v1 v1.0.0-20160220154919-db14e161995a/go.mod h1:KF9sEfUPAXdG8Oev9e99iLGnl2uJMjc5B+4y3O7x610= 354 | gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 355 | gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 356 | gopkg.in/fatih/set.v0 v0.2.1/go.mod h1:5eLWEndGL4zGGemXWrKuts+wTJR0y+w+auqUJZbmyBg= 357 | gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys= 358 | gopkg.in/jcmturner/aescts.v1 v1.0.1/go.mod h1:nsR8qBOg+OucoIW+WMhB3GspUQXq9XorLnQb9XtvcOo= 359 | gopkg.in/jcmturner/dnsutils.v1 v1.0.1/go.mod h1:m3v+5svpVOhtFAP/wSz+yzh4Mc0Fg7eRhxkJMWSIz9Q= 360 | gopkg.in/jcmturner/goidentity.v3 v3.0.0/go.mod h1:oG2kH0IvSYNIu80dVAyu/yoefjq1mNfM5bm88whjWx4= 361 | gopkg.in/jcmturner/gokrb5.v7 v7.2.3/go.mod h1:l8VISx+WGYp+Fp7KRbsiUuXTTOnxIc3Tuvyavf11/WM= 362 | gopkg.in/jcmturner/rpc.v1 v1.1.0/go.mod h1:YIdkC4XfD6GXbzje11McwsDuOlZQSb9W4vfLvuNnlv8= 363 | gopkg.in/karalabe/cookiejar.v2 v2.0.0-20150724131613-8dcd6a7f4951/go.mod h1:owOxCRGGeAx1uugABik6K9oeNu1cgxP/R9ItzLDxNWA= 364 | gopkg.in/natefinch/npipe.v2 v2.0.0-20160621034901-c1b8fa8bdcce/go.mod h1:5AcXVHNjg+BDxry382+8OKon8SEWiKktQR07RKPsv1c= 365 | gopkg.in/olebedev/go-duktape.v3 v3.0.0-20200619000410-60c24ae608a6 h1:a6cXbcDDUkSBlpnkWV1bJ+vv3mOgQEltEJ2rPxroVu0= 366 | gopkg.in/olebedev/go-duktape.v3 v3.0.0-20200619000410-60c24ae608a6/go.mod h1:uAJfkITjFhyEEuUfm7bsmCZRbW5WRq8s9EY8HZ6hCns= 367 | gopkg.in/redis.v4 v4.2.4/go.mod h1:8KREHdypkCEojGKQcjMqAODMICIVwZAONWq8RowTITA= 368 | gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw= 369 | gopkg.in/urfave/cli.v1 v1.20.0 h1:NdAVW6RYxDif9DhDHaAortIu956m2c0v+09AZBPTbE0= 370 | gopkg.in/urfave/cli.v1 v1.20.0/go.mod h1:vuBzUtMdQeixQj8LVd+/98pzhxNGQoyuPBlsXHOQNO0= 371 | gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 372 | gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 373 | gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 374 | gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 375 | gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw= 376 | honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= 377 | -------------------------------------------------------------------------------- /handler/main.go: -------------------------------------------------------------------------------- 1 | package handlers 2 | 3 | import ( 4 | "encoding/json" 5 | "fmt" 6 | "net/http" 7 | 8 | Models "github.com/LuisAcerv/goeth-api/models" 9 | Modules "github.com/LuisAcerv/goeth-api/modules" 10 | "github.com/ethereum/go-ethereum/common" 11 | "github.com/ethereum/go-ethereum/ethclient" 12 | "github.com/gorilla/mux" 13 | ) 14 | 15 | // ClientHandler ethereum client instance 16 | type ClientHandler struct { 17 | *ethclient.Client 18 | } 19 | 20 | func (client ClientHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { 21 | // Get parameter from url request 22 | vars := mux.Vars(r) 23 | module := vars["module"] 24 | 25 | // Get the query parameters from url request 26 | address := r.URL.Query().Get("address") 27 | hash := r.URL.Query().Get("hash") 28 | 29 | // Set our response header 30 | w.Header().Set("Content-Type", "application/json") 31 | 32 | // Handle each request using the module parameter: 33 | switch module { 34 | case "latest-block": 35 | _block := Modules.GetLatestBlock(*client.Client) 36 | json.NewEncoder(w).Encode(_block) 37 | 38 | case "get-tx": 39 | if hash == "" { 40 | json.NewEncoder(w).Encode(&Models.Error{ 41 | Code: 400, 42 | Message: "Malformed request", 43 | }) 44 | return 45 | } 46 | txHash := common.HexToHash(hash) 47 | _tx := Modules.GetTxByHash(*client.Client, txHash) 48 | 49 | if _tx != nil { 50 | json.NewEncoder(w).Encode(_tx) 51 | return 52 | } 53 | 54 | json.NewEncoder(w).Encode(&Models.Error{ 55 | Code: 404, 56 | Message: "Tx Not Found!", 57 | }) 58 | 59 | case "send-eth": 60 | decoder := json.NewDecoder(r.Body) 61 | var t Models.TransferEthRequest 62 | 63 | err := decoder.Decode(&t) 64 | 65 | if err != nil { 66 | fmt.Println(err) 67 | json.NewEncoder(w).Encode(&Models.Error{ 68 | Code: 400, 69 | Message: "Malformed request", 70 | }) 71 | return 72 | } 73 | _hash, err := Modules.TransferEth(*client.Client, t.PrivKey, t.To, t.Amount) 74 | 75 | if err != nil { 76 | fmt.Println(err) 77 | json.NewEncoder(w).Encode(&Models.Error{ 78 | Code: 500, 79 | Message: "Internal server error", 80 | }) 81 | return 82 | } 83 | 84 | json.NewEncoder(w).Encode(&Models.HashResponse{ 85 | Hash: _hash, 86 | }) 87 | 88 | case "get-balance": 89 | if address == "" { 90 | json.NewEncoder(w).Encode(&Models.Error{ 91 | Code: 400, 92 | Message: "Malformed request", 93 | }) 94 | return 95 | } 96 | 97 | balance, err := Modules.GetAddressBalance(*client.Client, address) 98 | 99 | if err != nil { 100 | fmt.Println(err) 101 | json.NewEncoder(w).Encode(&Models.Error{ 102 | Code: 500, 103 | Message: "Internal server error", 104 | }) 105 | return 106 | } 107 | 108 | json.NewEncoder(w).Encode(&Models.BalanceResponse{ 109 | Address: address, 110 | Balance: balance, 111 | Symbol: "Ether", 112 | Units: "Wei", 113 | }) 114 | 115 | } 116 | 117 | } 118 | -------------------------------------------------------------------------------- /hdwallet/main.go: -------------------------------------------------------------------------------- 1 | package hdwallet 2 | 3 | import ( 4 | "fmt" 5 | "log" 6 | 7 | "github.com/defistuff/go-bip39" 8 | hdwallet "github.com/defistuff/go-ethereum-hdwallet" 9 | ) 10 | 11 | // CreateWallet Generates a new HD Wallet 12 | func CreateWallet() { 13 | 14 | // generate a random Mnemonic in English with 256 bits of entropy 15 | entropy, _ := bip39.NewEntropy(256) 16 | mnemonic, _ := bip39.NewMnemonic(entropy) 17 | 18 | // print the Mnemonic as a sentence 19 | fmt.Println(mnemonic) 20 | 21 | wallet, err := hdwallet.NewFromMnemonic(mnemonic) 22 | if err != nil { 23 | log.Fatal(err) 24 | } 25 | 26 | path := hdwallet.MustParseDerivationPath("m/44'/60'/0'/0/0") 27 | account, err := wallet.Derive(path, false) 28 | if err != nil { 29 | log.Fatal(err) 30 | } 31 | 32 | fmt.Println(account.Address.Hex()) // 0xC49926C4124cEe1cbA0Ea94Ea31a6c12318df947 33 | 34 | path = hdwallet.MustParseDerivationPath("m/44'/60'/0'/0/1") 35 | account, err = wallet.Derive(path, false) 36 | if err != nil { 37 | log.Fatal(err) 38 | } 39 | 40 | fmt.Println(account.Address.Hex()) // 0x8230645aC28A4EdD1b0B53E7Cd8019744E9dD559 41 | } 42 | -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "fmt" 5 | "log" 6 | "net/http" 7 | 8 | Handlers "github.com/LuisAcerv/goeth-api/handler" 9 | "github.com/ethereum/go-ethereum/ethclient" 10 | "github.com/gorilla/mux" 11 | ) 12 | 13 | func main() { 14 | // Create a client instance to connect to our providr 15 | client, err := ethclient.Dial("http://localhost:7545") 16 | 17 | if err != nil { 18 | fmt.Println(err) 19 | } 20 | 21 | // Create a mux router 22 | r := mux.NewRouter() 23 | 24 | // We will define a single endpoint 25 | r.Handle("/api/v1/eth/{module}", Handlers.ClientHandler{client}) 26 | log.Fatal(http.ListenAndServe(":8080", r)) 27 | } 28 | -------------------------------------------------------------------------------- /models/main.go: -------------------------------------------------------------------------------- 1 | package models 2 | 3 | // Block data structure 4 | type Block struct { 5 | BlockNumber int64 `json:"blockNumber"` 6 | Timestamp uint64 `json:"timestamp"` 7 | Difficulty uint64 `json:"difficulty"` 8 | Hash string `json:"hash"` 9 | TransactionsCount int `json:"transactionsCount"` 10 | Transactions []Transaction `json:"transactions"` 11 | } 12 | 13 | // Transaction data structure 14 | type Transaction struct { 15 | Hash string `json:"hash"` 16 | Value string `json:"value"` 17 | Gas uint64 `json:"gas"` 18 | GasPrice uint64 `json:"gasPrice"` 19 | Nonce uint64 `json:"nonce"` 20 | To string `json:"to"` 21 | Pending bool `json:"pending"` 22 | } 23 | 24 | // TransferEthRequest data structure 25 | type TransferEthRequest struct { 26 | PrivKey string `json:"privKey"` 27 | To string `json:"to"` 28 | Amount int64 `json:"amount"` 29 | } 30 | 31 | // HashResponse data structure 32 | type HashResponse struct { 33 | Hash string `json:"hash"` 34 | } 35 | 36 | // BalanceResponse data structure 37 | type BalanceResponse struct { 38 | Address string `json:"address"` 39 | Balance string `json:"balance"` 40 | Symbol string `json:"symbol"` 41 | Units string `json:"units"` 42 | } 43 | 44 | // Error data structure 45 | type Error struct { 46 | Code uint64 `json:"code"` 47 | Message string `json:"message"` 48 | } 49 | -------------------------------------------------------------------------------- /modules/main.go: -------------------------------------------------------------------------------- 1 | package modules 2 | 3 | import ( 4 | "context" 5 | "crypto/ecdsa" 6 | "fmt" 7 | "log" 8 | "math/big" 9 | 10 | Models "github.com/LuisAcerv/goeth-api/models" 11 | "github.com/ethereum/go-ethereum/common" 12 | "github.com/ethereum/go-ethereum/core/types" 13 | "github.com/ethereum/go-ethereum/crypto" 14 | "github.com/ethereum/go-ethereum/ethclient" 15 | ) 16 | 17 | // GetLatestBlock from blockchain 18 | func GetLatestBlock(client ethclient.Client) *Models.Block { 19 | // We add a recover function from panics to prevent our API from crashing due to an unexpected error 20 | defer func() { 21 | if err := recover(); err != nil { 22 | fmt.Println(err) 23 | } 24 | }() 25 | 26 | // Query the latest block 27 | header, _ := client.HeaderByNumber(context.Background(), nil) 28 | blockNumber := big.NewInt(header.Number.Int64()) 29 | block, err := client.BlockByNumber(context.Background(), blockNumber) 30 | 31 | if err != nil { 32 | log.Fatal(err) 33 | } 34 | 35 | // Build the response to our model 36 | _block := &Models.Block{ 37 | BlockNumber: block.Number().Int64(), 38 | Timestamp: block.Time(), 39 | Difficulty: block.Difficulty().Uint64(), 40 | Hash: block.Hash().String(), 41 | TransactionsCount: len(block.Transactions()), 42 | Transactions: []Models.Transaction{}, 43 | } 44 | 45 | for _, tx := range block.Transactions() { 46 | _block.Transactions = append(_block.Transactions, Models.Transaction{ 47 | Hash: tx.Hash().String(), 48 | Value: tx.Value().String(), 49 | Gas: tx.Gas(), 50 | GasPrice: tx.GasPrice().Uint64(), 51 | Nonce: tx.Nonce(), 52 | To: tx.To().String(), 53 | }) 54 | } 55 | 56 | return _block 57 | } 58 | 59 | // GetTxByHash by a given hash 60 | func GetTxByHash(client ethclient.Client, hash common.Hash) *Models.Transaction { 61 | 62 | defer func() { 63 | if err := recover(); err != nil { 64 | fmt.Println(err) 65 | } 66 | }() 67 | 68 | tx, pending, err := client.TransactionByHash(context.Background(), hash) 69 | if err != nil { 70 | fmt.Println(err) 71 | } 72 | 73 | return &Models.Transaction{ 74 | Hash: tx.Hash().String(), 75 | Value: tx.Value().String(), 76 | Gas: tx.Gas(), 77 | GasPrice: tx.GasPrice().Uint64(), 78 | To: tx.To().String(), 79 | Pending: pending, 80 | Nonce: tx.Nonce(), 81 | } 82 | } 83 | 84 | // TransferEth from one account to another 85 | func TransferEth(client ethclient.Client, privKey string, to string, amount int64) (string, error) { 86 | 87 | defer func() { 88 | if err := recover(); err != nil { 89 | fmt.Println(err) 90 | } 91 | }() 92 | 93 | // Assuming you've already connected a client, the next step is to load your private key. 94 | privateKey, err := crypto.HexToECDSA(privKey) 95 | if err != nil { 96 | return "", err 97 | } 98 | 99 | // Function requires the public address of the account we're sending from -- which we can derive from the private key. 100 | publicKey := privateKey.Public() 101 | publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey) 102 | if !ok { 103 | return "", err 104 | } 105 | 106 | fromAddress := crypto.PubkeyToAddress(*publicKeyECDSA) 107 | 108 | // Now we can read the nonce that we should use for the account's transaction. 109 | nonce, err := client.PendingNonceAt(context.Background(), fromAddress) 110 | if err != nil { 111 | return "", err 112 | } 113 | 114 | value := big.NewInt(amount) // in wei (1 eth) 115 | gasLimit := uint64(21000) // in units 116 | gasPrice, err := client.SuggestGasPrice(context.Background()) 117 | if err != nil { 118 | return "", err 119 | } 120 | 121 | // We figure out who we're sending the ETH to. 122 | toAddress := common.HexToAddress(to) 123 | var data []byte 124 | 125 | // We create the transaction payload 126 | tx := types.NewTransaction(nonce, toAddress, value, gasLimit, gasPrice, data) 127 | 128 | chainID, err := client.NetworkID(context.Background()) 129 | if err != nil { 130 | return "", err 131 | } 132 | 133 | // We sign the transaction using the sender's private key 134 | signedTx, err := types.SignTx(tx, types.NewEIP155Signer(chainID), privateKey) 135 | if err != nil { 136 | return "", err 137 | } 138 | 139 | // Now we are finally ready to broadcast the transaction to the entire network 140 | err = client.SendTransaction(context.Background(), signedTx) 141 | if err != nil { 142 | return "", err 143 | } 144 | 145 | // We return the transaction hash 146 | return signedTx.Hash().String(), nil 147 | } 148 | 149 | // GetAddressBalance returns the given address balance =P 150 | func GetAddressBalance(client ethclient.Client, address string) (string, error) { 151 | account := common.HexToAddress(address) 152 | balance, err := client.BalanceAt(context.Background(), account, nil) 153 | if err != nil { 154 | return "0", err 155 | } 156 | 157 | return balance.String(), nil 158 | } 159 | --------------------------------------------------------------------------------